Abstract
Keywords
1 Introduction
The ultrafast intensity-rotating optical field (UIROF) has several interesting features. Its spatial structure rotates temporally and depends on the orbital angular momentum (OAM)[
Several methods have been developed to generate optical fields with their rotating intensities. The fields rotating at the frequency from tens of hertz to hundreds of megahertz have been achieved by using spatial light modulators (SLMs), which can introduce a frequency difference between two vortex beams[
Here, we present a design to generate a tunable UIROF with tunable ultrafast rotating speed, which results from overlapping two 20 Hz chirped vortex pulses with different topological charges (TCs),
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2 Principle and numerical simulation of our tunable UIROF
Our tunable UIROF can be constituted by overlapping two vortex pulses,
Equation (
Figure
3 Experimental arrangement and results
We realize experimentally our tunable UIROF as shown in Figure
In our design, the beat frequency shall be
We can see that the rotating period
In our experiment, a commercial 20 Hz, 35 fs, 800 nm Ti:S laser system with a pulse energy of 3.5 mJ is used to generate tunable UIROF at a low repetition rate and strong intensity. One can note that because we can accurately control the chirped pulse width
Under these circumstances, an ultrafast single-shot imaging device with an imaging rate beyond 10 Tfps is designed by noncollinear optical-parametric amplifiers (NCOPAs) to obtain the rotating characteristic of the tunable UIROF. As is known, an optical-parametric amplifier (OPA) can map the signal information into an idler beam with high spatial resolution[
Here, we get experimentally a UIROF with an angular velocity of
4 Conclusions
In summary, a tunable UIROF at 20 Hz with a tunable rotating speed beyond
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